package com.tdx.blog_nowcoder.excepetion;

import com.tdx.blog_nowcoder.utils.DumpJSONToString;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.bind.annotation.ExceptionHandler;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;

@ControllerAdvice(annotations = {Controller.class}) //注解范围
public class ExceptionAdvice {
    private static final Logger logger = LoggerFactory.getLogger(ExceptionAdvice.class);
    @ExceptionHandler({Exception.class})
    public void exceptionHandler(Exception e, HttpServletResponse response,
                                 HttpServletRequest request) throws IOException {
            logger.error("服务器端发生异常！"+e.getMessage());
            for (StackTraceElement element : e.getStackTrace()) {
                logger.error(element.toString());
            }
            String xRequestedWith = request.getHeader("x-requested-with");
            if ("XMLHttpRequest".equals(xRequestedWith)) {
                response.setContentType("application/plain;charset=utf-8");
                PrintWriter writer = response.getWriter();
                writer.write(DumpJSONToString.getJsonString(500, "服务器异常!"));
            } else {
                response.sendRedirect(request.getContextPath() + "/error");
            }
    }
}
